add CodeGen support for the alloc_size attribute
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@157483 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGCall.cpp b/lib/CodeGen/CGCall.cpp
index 3ad1df1..650fe8b 100644
--- a/lib/CodeGen/CGCall.cpp
+++ b/lib/CodeGen/CGCall.cpp
@@ -2087,6 +2087,23 @@
CS.setAttributes(Attrs);
CS.setCallingConv(static_cast<llvm::CallingConv::ID>(CallingConv));
+ // add metadata for __attribute__((alloc_size(foo)))
+ if (TargetDecl) {
+ if (const AllocSizeAttr* Attr = TargetDecl->getAttr<AllocSizeAttr>()) {
+ std::vector<llvm::Value*> Args;
+ llvm::IntegerType *Ty = llvm::IntegerType::getInt32Ty(getLLVMContext());
+ bool isMethod = isa<CXXMethodDecl>(TargetDecl);
+
+ for (AllocSizeAttr::args_iterator I = Attr->args_begin(),
+ E = Attr->args_end(); I != E; ++I) {
+ Args.push_back(llvm::ConstantInt::get(Ty, *I + isMethod));
+ }
+
+ llvm::MDNode *MD = llvm::MDNode::get(getLLVMContext(), Args);
+ CS.getInstruction()->setMetadata("alloc_size", MD);
+ }
+ }
+
// In ObjC ARC mode with no ObjC ARC exception safety, tell the ARC
// optimizer it can aggressively ignore unwind edges.
if (CGM.getLangOpts().ObjCAutoRefCount)
diff --git a/test/CodeGen/alloc_size.c b/test/CodeGen/alloc_size.c
new file mode 100644
index 0000000..05aa845
--- /dev/null
+++ b/test/CodeGen/alloc_size.c
@@ -0,0 +1,11 @@
+// RUN: %clang_cc1 %s -emit-llvm -o - | FileCheck %s
+
+void *my_recalloc(void *, unsigned, unsigned) __attribute__((alloc_size(2,3)));
+
+// CHECK: @f
+void* f() {
+ // CHECK: call i8* @my_recalloc{{.*}}, !alloc_size !0
+ return my_recalloc(0, 11, 27);
+}
+
+// CHECK: !0 = metadata !{i32 1, i32 2}